A system overcurrent protection circuit applied to a control circuit board of a floor sweeping robot

Abstract

The invention provides a system overcurrent protection circuit applied to a control circuit board of a floor sweeping robot, comprising a battery interface connected with a power supply, a power switch interface connected in series with the battery interface, and a plurality of load circuit units connected in parallel. Between that power switch interface and each load circuit unit, a self-recoveryfuse is connected in series, which can be changed into a high-resistance state when the current is suddenly increased. One end of each load circuit unit is connected with one end of a self-recovery fuse, and the other end is connected with a common ground; The negative electrode connector of the battery interface is serially connected with a resistor R1 and then connected with a common ground, When a load in a system is overcurrent or short-circuited, As that current is instantaneously increase, the temperature of the self-restoring fuse element is suddenly increased, and the element become ahigh-resistance protection state, so as to achieve the purpose of disconnecting the battery from the load and protecting the battery. Aft the load is overcurrent, the fuse acts and the battery voltage can be output normally, and the load overcurrent does not impinge the battery, thereby achieving the effect of protecting the battery.

Description

[technical field] [0001] The invention relates to the technical field of overcurrent protection circuits, in particular to a system overcurrent protection circuit applied to a control circuit board of a sweeping robot that can effectively protect components from overcurrent. [Background technique] [0002] In recent years, sweeping robot products have been rapidly promoted and applied, not only in terms of structure but also in terms of specific functions. There has been a substantial technological improvement. Because it can automatically clean and collect debris in the house, and has a certain degree of intelligence level, so the prospects for the use of sweeping robots are very prominent. [0003] The internal circuit system of the sweeping robot is a more important part in the actual application process. In systems powered by lithium batteries such as sweeping machines, if the lithium battery is over-discharged, the capacity will decrease, the internal resistance will in...

AI Technical Summary

Problems solved by technology

[0003] The internal circuit system of the sweeping robot is a more important part in the actual application process. In systems powered by lithium batteries such as sweeping machines, if the lithium battery is over-discharged, the capacity will decrease, the internal resistance will increase, and the lifespan will be shortened. Recovery and other hazards, based on this, in order to protect the battery and prolong the service life of the battery, it is a problem often considered by those skilled in the art. A lot of research and development and experiments have also been carried out, and good results have been achieved.

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